Cross-rolling mild.



R. E. BROCK.

GROSS ROLLING MILL.

APPLICATION FILED 11110.4, 1911.

1,1 1 5,495. Patented Nov. 3, 1914.

2 SHEETSSHEET 1.

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, 77m @0641; iiim UNITED STATEs PATENT OFFICE.

RICHARD E. BROCK, or MoNEs's'EN, PENNSYLVANIA, ASSIGNOR TO PITTSBURGHSTEEL PRODUCTS 00., 0F PITTSBURGH, PENNSYLVANIA, A CORPORATION VANIA.

Specification of Letters Patent.

OF PENNSYL- Patented Nov. 3, 1914.

Application filed December 4, 1911. Serial No. 663,893.

1 "0 all whom it may concern:

Be it known that I, RICHARD E. 311001;, a citizen of the United States,and resident of -Mon.essen, in the county of Westmoreland lowing to be afull, clear, and exact description thereof.

My invention relates to cross-rolling or expanding mills.

In the manufacture of tubing, more particularly seamless tubing, wherethe tube is rolled on a mandrel in a plug mill it is necessary to givethe tube a pass through an expanding or cross-rolling mill in order tobring the tube to the proper gage and remove any source or imperfectionson the interior of the tube caused by the rolling in the plug-mill.

The object of my invention is to provide a mill of this character inwhich the tube is so supported during the cross-rolling as to guard itsexterior against scratches, while "less power is required, and greaterease of adjustment of the rolls is obtained.

To these ends my invention comprises generally stated, a mill of thischaracter comprising the cross-rolls with an adjustable idle-rollerforming one side of the pass, and means for holding the tube against theidleroller with the axial line of the pass outside the mean center lineof the main rolls,-where by I obtain substantially the effect of a 3-roll machine and secure greater steadiness of operation, the tubeturning in contact with 1 the idle-roll and reducing the liability of Iscratching of the same.

In the accompanying drawings, Figure 1 is an end elevation partly insection of my improved mill; Fig. 2 is a vertical section'; and Fig. 3is an enlargedview of the pass; Fig. 4 is a similar view of a modifiedform of ass.

IE1 the drawings the numeral 2 designates thehousing of the millwhich'may be of any suitable construction and journaled within saidhousing are the cross-rolls 3 and 4, set at an angle to each other inthe ordinary manner. The shape of these cross-rolls may vary and 1 donot limit myself to any articular size or shape. The bearing bloc s 5and 6 are contained within the guides 7 of the housings and said bearingblocks are adustable by means of the ordinary mechan1sm comprising thescrew-bar 8 carrying the worm-wheel 9 which is engaged bythe worm 10. I

The idle-roll 11 is mount-ed in suitable bearings in the adjustablebearing blocks 12. Each bearing-block is mounted in the guides 13 andits position in said guides is controlled by the screw-bar 14 connectedthereto. The upper end of the screw-b'arhas the bevel-pinion 15 which isengaged by the bevel-pinion 16 on the shaft 17 which carries thehand-wheel 18. 'By turning the handwheel 18, the roll 11 may be adjustedas desired.

. A support 19 may be employed if desired at the bottom of the passformed by the rolls 3,.4 and 11, and said support is mounted on thevertically adjustable block 20 mounted in guides 21. The lever 22engages said block 20 and said lever is connected up to an adjustingscrew 23 for controlling the position of the block 20 and the support 19carried thereby.

The mandrel-bar 24 is supported in any suitable manner and saidmandrel-bar carries the mandrel-plug 25.

In cross-rolling a tube in my improved mill, the tube is fed to therolls in any suitable manner, and as the tube passes throu h the millthe rollers 3 and 4 act upon t e outer Walls of said tube, and inrolling it will be observed that the center or axial line of the billet.when in the pass is above the mean center line of the rolls 3 and 4.Accordingly in rolling the said rolls 3 and 4 act to force the tubetoward the upper idle-roll ation and the amount of power required isreduced to a minimum. By having the tube bearing in contact with theidle-roll, the wear on the idle-r011 is ver light, and the expense ofrenewal of stationary guides is obviated. v The lower guide 19'does notcome in con tact-with the tube during the rolling ope] ation, and infact might be dispensed with so far as the practical operation of mymill is concerned. I j

The rolls 3 and I are readily adjustable in order to maintain the properpass-line, while at the same time the adjustment of the idleroll 11 mayalso be readily accomplished. The idle-roll 11 bears only at a point ofits periphery against the tube and consequently the friction is greatlyreduced and the power required in the reduction of the tube isaccordingly likewise reduced.

By having the roll 11 adjustable vertically the pressure on the tube canbe quickly and accurately regulated even while the tube is passingthrough the mill. This obviates the necessity of adjustment of the largerolls 3 and 4 except to maintain the pass-line above the mean center ofsaid rolls as shown in Fig. 3.

In Fig. 4 I have illustrated a modified form of my invention in whichthe idle-roll is maintained below the'pass-line, and said pass-line iscarried below the main center of the main rolls.

What I clai'm is': i

1. In a cross-rolling mill, the combination of the housing, cross-rollsmounted therein, a vertically-adjustable idle-roll between saidcross-rolls, and a mandrel-plug within the pass, the axial line of thepass being outside the mean center of the cross-rolls toward saididle-roll, whereby said cross-rolls tend to hold the tube against saidadjustable idleroll.

2. In a cross-rolling mill, the combination of the housing,.cross-rollsmounted therein, a vertically adjustable idle-roll atthe top of the'passbetween said cross-rolls, and a mandrel-plug within the pass, the axialline of the pass being above the mean center of the cross-rolls, wherebysaid cross-rolls tend to .h0ld.the tube against said idle-roll.

In testimony whereof, I the said RICHARD E. BROOK have hereunto set myhand.

RICHARD E. BROOK.

